The constable was identified as RG Jojon Akhanda, 40, from Anwara upazila, Chittagong.
Pranab Chowdhury, Officer-in-Charge of Halishahar police station said that the wheat-laden truck was returning from the Central Storage Depot (CSD) at Halishahar in the port city.
The traffic constable had signaled the truck driver to stop when instead he began to speed towards Akhanda and ran him over.
Akhanda was taken to Chittagong Medical College Hospital in a critical condition where the on-duty doctors pronounced him dead.
“We have arrested the truck driver Md Russell and his assistant Md Musa. We are investigating whether the driver ran over the traffic constable intentionally or he lost control of his vehicle,” said the Halishahar OC.
A case has been filed with Halishahar police station against the duo in connection.